The Welsh Government has been given £35 million by the Treasury due to HS2.
It has been awarded the money as a Barnett Consequential - where funding is allocated via the Barnett formula for determining a nation's share of a scheme it is not involved with. HS2 will connect London with Birmingham and later with Leeds and Manchester, avoiding Wales entirely.
However, some opponents are arguing the total amount given to Wales could reach £5 billion.
Speaking to ITV, Joe Rukin from the Stop HS2 Campaign said: "The award for Barnett money to Wales is a clear admission that HS2 doesn't benefit Wales, it hurts Wales, the same way it hurts many other parts of the country."
Mr Rukin argues, by paying the country through Barnett Consequentials, Northern Ireland should also qualify. He states a possible £5.3 billion will be added on top of the current £50.1 billion project.
The news comes after BBC Newsnight announced undeclared findings from KPMG's recent report on HS2 - commissioned by the government - suggesting areas not connected to the scheme would lose money as a result. Cardiff is estimated to be one of the worst affected, with a potential loss of £68 million.
Transport secretary Patrick McLoughlin said other schemes would be available in these areas instead.